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Donald Trump argues that America loses big time on trade. "The great American middle class is disappearing. One of the factors driving this economic devastation is America's disastrous trade policies," Trump wrote in a new op ed in USA Today.

He says he'll use his deal making skills to turn America back into a winner in trade with China, Mexico and others.

But business leaders and economists from both sides of the aisle warn Trump's idea to slap hefty fees on Chinese and Mexican imports as much as 45% would be disastrous for the economy.

"The American worker is being crushed" by trade, Trump says. As proof, he cites research from the left leaning Economic Policy Institute that found America has lost 900,000 jobs to Mexico since the North American Free Trade Agreement was signed in late 1993.

The job losses are the subject of a huge debate. jobs have been created because of NAFTA.

Regardless, this discussion ignores the impact of technology and innovation on traditional middle class jobs.

"Trade is a factor, but technological change has been more important," says Robert Lawrence, professor of international trade at Harvard's Kennedy School of Government. Computers and robots are replacing manufacturing jobs. The predictions are that even more positions including "highly skilled" ones will be replaced by robots in the coming years.

Trump says "I am the only candidate in this race who will bring our manufacturing jobs back," but he doesn't seem to be addressing the real cause of the decline in manufacturing jobs: machines.

Related: Is trade really killing middle class jobs?

2. Trump: Ohio has lost 100,000 jobs to trade

In his op ed, Trump argues that states like Ohio have been especially hard hit by trade. "An Economic Policy Institute analysis found that Ohio has already lost more than 100,000 jobs to Trans Pacific Partnership countries," he writes.

Here's the catch: Ohio has a 4.9% unemployment rate, meaning the state is basically at full employment. While it's true that some jobs have been lost, others are being created. For example, Ohio has benefited from America's energy boom and a resurgence of steel jobs to make the pipes to transport natural gas.

Related: How Donald Trump could cause a recession

3. currently has 20 free trade deals in place) and put taxes (known as tariffs) on Chinese and Mexican imports. again.

The problem is China and Mexico aren't likely to send Trump a thank you note. Nike Air Max 2016 goods coming into their countries. It could cause a global trade war.

"His plan to put on a 35% tariff on goods imported would sink this country into a recession. It would penalize global companies that are trying to be competitive globally," HP Enterprises (HPE, Tech30) CEO Meg Whitman, a prominent Republican, said recently.

The American Action Forum, a right leaning think tank, estimates that Trump's tariffs on China would cost Americans an average of $675 per person a year. (The Mexico tariff would cost over $100 a person).

Related: The Trump business that failed in two years

4. Trump says stop the TPP trade deal

Trump has a big warning about the future: "The situation is about to get drastically worse if the Trans Pacific Partnership is not stopped. One of the first casualties of the TPP will be America's auto industry, and among the worst victims of this pact will be the people of Ohio."

He points out that his rivals for the Republican nomination Gov. Kasich, Sen. Ted Cruz and Sen. Marco Rubio all support TPP.

TPP is a trade agreement that's been years in the making. It would create a free trade zone around the Pacific Ocean, bringing together 12 countries that account for 40% of the world's economy. China is not part of the agreement, so the deal could help contain China's economic influence.